A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load
A Weighted Current Feedback (WCF) technique for output capacitorless low-dropout (OCL-LDO) regulator is presented in this paper. Through feedback of a weighted current, the WCF permits smart management of the output impedance as well as the gain from the inter-gain stage. Based on the Routh-Hurwitz...
| Main Authors: | , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
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2014
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| Online Access: | https://hdl.handle.net/10356/103455 http://hdl.handle.net/10220/24500 |
| _version_ | 1824454545390960640 |
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| author | Tan, Xiao Liang Chong, Sau Siong Chan, Pak Kwong Dasgupta, Uday |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Tan, Xiao Liang Chong, Sau Siong Chan, Pak Kwong Dasgupta, Uday |
| author_sort | Tan, Xiao Liang |
| collection | NTU |
| description | A Weighted Current Feedback (WCF) technique for output capacitorless low-dropout (OCL-LDO) regulator is presented in this paper. Through feedback of a weighted current, the WCF permits smart management of the output impedance as well as the gain from the inter-gain stage. Based on the Routh-Hurwitz stability criterion, the WCF can avoid the right-half plane (RHP) pole and push the left-half plane (LHP) non-dominant complex pole pair to a higher frequency. Besides, it provides good regulator loop gain and fast transient response. Validated by UMC 65 nm CMOS process, the simulation and measurement results have shown that the WCF LDO regulator can operate at a load capacitance (CL) range from 470 pF to 10 nF with only 3.8 pF compensation capacitor. At a supply of 0.75 V and a quiescent current of 15.9 μA, the proposed circuit can support a maximum load current (IL) of 50 mA. When IL switches from 0 to 50 mA in 100 ns, the output can settle within 400 ns for the whole CL range. For a case of single capacitor (CL 470 pF), the settling time is only 250 ns. The comparison results have shown that the WCF LDO regulator offers a comparable or better transient figure-of-merit (FOM) and additional merit to drive wide load capacitance range. |
| first_indexed | 2025-02-19T03:24:01Z |
| format | Journal Article |
| id | ntu-10356/103455 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2025-02-19T03:24:01Z |
| publishDate | 2014 |
| record_format | dspace |
| spelling | ntu-10356/1034552020-03-07T14:00:36Z A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load Tan, Xiao Liang Chong, Sau Siong Chan, Pak Kwong Dasgupta, Uday School of Electrical and Electronic Engineering DRNTU::Engineering::Electrical and electronic engineering::Integrated circuits A Weighted Current Feedback (WCF) technique for output capacitorless low-dropout (OCL-LDO) regulator is presented in this paper. Through feedback of a weighted current, the WCF permits smart management of the output impedance as well as the gain from the inter-gain stage. Based on the Routh-Hurwitz stability criterion, the WCF can avoid the right-half plane (RHP) pole and push the left-half plane (LHP) non-dominant complex pole pair to a higher frequency. Besides, it provides good regulator loop gain and fast transient response. Validated by UMC 65 nm CMOS process, the simulation and measurement results have shown that the WCF LDO regulator can operate at a load capacitance (CL) range from 470 pF to 10 nF with only 3.8 pF compensation capacitor. At a supply of 0.75 V and a quiescent current of 15.9 μA, the proposed circuit can support a maximum load current (IL) of 50 mA. When IL switches from 0 to 50 mA in 100 ns, the output can settle within 400 ns for the whole CL range. For a case of single capacitor (CL 470 pF), the settling time is only 250 ns. The comparison results have shown that the WCF LDO regulator offers a comparable or better transient figure-of-merit (FOM) and additional merit to drive wide load capacitance range. Accepted version 2014-12-22T01:54:26Z 2019-12-06T21:13:04Z 2014-12-22T01:54:26Z 2019-12-06T21:13:04Z 2014 2014 Journal Article Tan, X. L., Chong, S. S., Chan, P. K., & Dasgupta, U. (2014). A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load. IEEE journal of solid-state circuits, 49(11), 2658-2672. 0018-9200 https://hdl.handle.net/10356/103455 http://hdl.handle.net/10220/24500 10.1109/JSSC.2014.2346762 en IEEE journal of solid-state circuits © 2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. The published version is available at: [Article DOI: http://dx.doi.org/10.1109/JSSC.2014.2346762]. 35 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Electrical and electronic engineering::Integrated circuits Tan, Xiao Liang Chong, Sau Siong Chan, Pak Kwong Dasgupta, Uday A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load |
| title | A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load |
| title_full | A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load |
| title_fullStr | A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load |
| title_full_unstemmed | A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load |
| title_short | A LDO regulator with weighted current feedback technique for 0.47nF-10nF capacitive load |
| title_sort | ldo regulator with weighted current feedback technique for 0 47nf 10nf capacitive load |
| topic | DRNTU::Engineering::Electrical and electronic engineering::Integrated circuits |
| url | https://hdl.handle.net/10356/103455 http://hdl.handle.net/10220/24500 |
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